Which sentence is wrong?

A. We don’t think it necessary to give students tests every week.

B. We don’t have to worry about not having enough to eat now.

C. My father has left school for over twenty years.

D. He was heard singing a pop song when I passed his room.

用所给动词的适当形式填空。

1．I’m hungry now．I ________ （not eat）my breakfast．

2．It’s useful for people ________ （take）care of the environment．

3．When I passed his room I heard him ________ （sing）an English song．

4．I ________ （watch）TV at 7:00 yesterday evening．

5．The book ________ （seem）very interesting．The boy likes it very much．

6．I’m glad ________ （see）you again．

7．Thank you for ________ （tell）me about what you like．

8．The USA is a very big country ________ （visit）．

9．Come on，better get ________（go）．

10．I’m enjoying ________ （learn）English．

Which sentence is wrong?

1. A.
   We don’t think it necessary to give students tests every week.
2. B.
   We don’t have to worry about not having enough to eat now.
3. C.
   My father has left school for over twenty years.
4. D.
   He was heard singing a pop song when I passed his room.